The 1968 Ford Mustang received a simpler grille and side trim and a limited number of 427 engines were slipped into the engine bays. These 427 engines were slightly detuned but still cranked out 390bhp, enough to strike fear on the streets. Then on April 1, 1968, Ford unveiled perhaps its most famous line of engines, the 428 Cobra Jet. It was based on the regular 428 but included larger valve heads, the race 427's intake manifold, and an oil-pan windage tray. It had ram-air induction and breathed through a functional hood scoop. Output was listed at 335bhp but was rumoured to be around 410bhp.
Performance:
(Cobra Jet) 428/335: 0-60 in 5.4 sec, 1/4 mile in 14.01@101mph.
Source:
http://www.musclecarclub.com/musclecars/ford-mustang/ford-mustang-history-1.shtmlBut real performance is more than special upholstery and the big news for 1969 was the availability of special 427 cid V8 equipped Camaros. The first were special dealer-installed units, most notably the Yenko Camaro 427. Yenko Sports Cars, based in Pennsylvania, along with other Chevy dealers such as Nickey in Chicago, Dana in California, and Baldwin-Motion in New York, would install the L72 427 cid block, rated at 425bhp by Chevrolet, ordered under the Central Office Production Order System (COPO) code 9562 into a buyer's Camaro. The Yenko Camaro 427 is a typical example: it came from the factory with no ornamentation, badging, and the 427 engine in a crate. Yenko installed the 427 block, changed the rating to a more realistic 450bhp, and added 15-inch rally wheels, bigger front roll bar, and sYc (Yenko Sports Car) badging. A full complement of racing add ons were available and sub 13 second quarter miles were possible with a few more dollars.
The 1969 Camaro:
...Overshadowing these dealer modified Camaros was the factory Camaro ZL1. Specially designed to compete in the NHRA Super Stock drag classes, Chevrolet made it an option under the COPO system (code 9560). The cars began as SS396/375bhp Camaros with the F41 suspension. The SS trim and engine were deleted, and the 427 engine, cowl-induction hood, front disc brakes, a choice of heavy duty 4 speed transmissions or Turbo Hydra-matic, and a 4:10 posi axle were added. But instead of the regular iron-block and head L72 found in the dealer installed Camaros, the ZL1 sported aluminum heads and the first aluminum block ever made by Chevrolet. It shared the L88 aluminum head/iron block's engine rating of 430 bhp but made closer to 500 bhp -- making it probably the most powerful engine Chevrolet ever offered to the public. And the engine weighed just 500 pounds, the same as Chevy's 327 small block. The car was blessed with a 5 year/50,000 mile warranty and was fully street legal. With factory exhausts and tires, it turned low 13s; with headers and slicks, it could turn 11.6s @ 122mph. This was the fastest car ever produced by Chevrolet.
Source:
http://www.musclecarclub.com/musclecars/chevrolet-camaro/chevrolet-camaro-history-1.shtmlThey sure sound like muscle cars to me.